CN111402797B - Brightness uniformity compensation method and device and display equipment - Google Patents
Brightness uniformity compensation method and device and display equipment Download PDFInfo
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- CN111402797B CN111402797B CN202010237554.9A CN202010237554A CN111402797B CN 111402797 B CN111402797 B CN 111402797B CN 202010237554 A CN202010237554 A CN 202010237554A CN 111402797 B CN111402797 B CN 111402797B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The embodiment of the application provides a brightness uniformity compensation method and device and display equipment. The brightness uniformity compensation method in the application comprises the following steps: when the display panel is in a working state, obtaining the luminous efficiency of the OLED in each area of the display panel according to a pre-obtained aging rule, and determining the aging degree of the OLED in the area with the lowest luminous efficiency. Therefore, when the display panel is in a compensation state, according to the aging rule, the luminous efficiency of the OLED in other areas with high luminous efficiency in the display panel is consistent with that of the OLED in the area with the lowest luminous efficiency, and the luminous efficiency of the OLED in each area in the display panel is the same.
Description
Technical Field
The embodiment of the application relates to the technical field of display, in particular to a brightness uniformity compensation method and device and display equipment.
Background
An Organic Light Emitting Diode (OLED) belongs to a current type Organic Light Emitting device, and emits Light by injecting and recombining carriers, and the Light Emitting intensity is in direct proportion to the injected current. Under the action of an electric field, holes generated by an anode and electrons generated by a cathode move, are respectively injected into a hole transport layer and an electron transport layer, and migrate to a light emitting layer. When the two meet at the light emitting layer, energy excitons are generated, thereby exciting the light emitting molecules to finally generate visible light. At present, the OLED display panel has been applied to the display field of mobile phones, flat panels, and the like.
However, the OLED display panel has a problem in that the OLED display panel is aged to reduce its light emitting efficiency, and the OLED display panel is not uniform in screen brightness due to different degrees of aging.
Disclosure of Invention
The embodiment of the application provides a brightness uniformity compensation method and device and a display device, so that the aging degree of a light-emitting device in other regions of a display panel is consistent with the aging degree of the light-emitting device in the region with the most serious aging degree, and thus, when the display panel is in a working state next time, the brightness of each region of the display panel is consistent, and the watching experience of a user is improved.
In a first aspect, an embodiment of the present application provides a method for compensating luminance uniformity, including:
when the display panel is in an operating state, acquiring the luminous efficiency of the light-emitting devices in each area of the display panel according to the aging rule of the light-emitting devices in a sample area, wherein the size and the shape of the sample area are respectively the same as those of any area in each area of the display panel;
determining a reference region according to the luminous efficiency of the light emitting devices in each region, wherein the reference region is the region with the lowest luminous efficiency of the light emitting devices in all regions of the display panel;
when the display panel is in a compensation state, carrying out aging treatment on the light-emitting devices in the to-be-compensated area of the display panel according to the aging rule, so that the light-emitting efficiency of the light-emitting devices in the to-be-compensated area is consistent with the light-emitting efficiency of the light-emitting devices in the reference area, wherein the to-be-compensated area is all other areas of the display panel which do not comprise the reference area;
wherein the aging rule is used for indicating the relationship among the change value of the luminous efficiency of the light-emitting device, the current density and the luminous time at the current density.
Optionally, the method further includes:
acquiring the time length of a light-emitting device in the sample area at least one preset gray scale, the current density corresponding to each preset gray scale and the light-emitting efficiency of the light-emitting device in the sample area;
and acquiring the aging rule corresponding to the sample region according to the time length of the light-emitting device in each preset gray scale in the sample region, the current density corresponding to each preset gray scale and the light-emitting efficiency of the light-emitting device in the sample region.
Optionally, the aging the light emitting device in the region to be compensated of the display panel according to the aging rule, so that the light emitting efficiency of the light emitting device in the region to be compensated is consistent with the light emitting efficiency of the light emitting device in the reference region, includes:
obtaining the difference value of the luminous efficiency between the luminous efficiency of the luminous device in each region in the region to be compensated and the luminous efficiency of the luminous device in the reference region;
and carrying out aging treatment on the light-emitting devices in the to-be-compensated region according to the difference value between the aging rule and the light-emitting efficiency, so that the light-emitting efficiency of the light-emitting device in each region in the to-be-compensated region is consistent with the light-emitting efficiency of the light-emitting device in the reference region.
Optionally, the aging the light emitting device in the region to be compensated according to the difference between the aging rule and the light emitting efficiency to make the light emitting efficiency of the light emitting device in each region of the region to be compensated consistent with the light emitting efficiency of the light emitting device in the reference region includes:
and adjusting the current density of the light-emitting device in each area in the area to be compensated and the light-emitting time at the current density according to the aging rule and the difference value of the light-emitting efficiency, so that the change value of the light-emitting efficiency of the light-emitting device in each area in the area to be compensated, caused by the current density and the light-emitting time at the current density, is consistent with the difference value of the light-emitting efficiency.
Optionally, the adjusting, according to the difference between the aging rule and the light-emitting efficiency, the current density of the light-emitting device in each of the regions to be compensated and the light-emitting time at the current density includes:
applying a driving voltage to the light emitting device in each of the regions to be compensated;
adjusting the current density of the light emitting device in each area in the area to be compensated by adjusting the driving voltage;
and determining the light emitting time at the current density according to the aging rule, the difference value of the light emitting efficiency and the current density.
Optionally, the determining, according to the aging rule, the difference between the aging degrees, and the current density, the light emitting duration at the current density includes:
and according to the difference value between the aging rule and the luminous efficiency, increasing the current density of the luminous device in each area in the area to be compensated so as to reduce the luminous time at the current density.
Optionally, the obtaining the light emitting efficiency of the light emitting device in each region of the display panel according to the aging rule of the light emitting device in the sample region includes:
acquiring the driving voltage of a light emitting device in each area of the display panel;
obtaining the current density of a light-emitting device in each area of the display panel and the time length of the light-emitting device in the current density according to the driving voltage;
and acquiring the aging degree of the light-emitting device in each area of the display panel according to the aging rule, the current density of the light-emitting device in each area of the display panel and the time length of the light-emitting device in the current density.
Optionally, the aging rule is as follows: k ═ f (J, t), where K denotes a change value of luminous efficiency of the light emitting device, J denotes a current density, and t denotes a time period at the current density, where the current density and the time period at the current density are in positive correlation with the degree of aging of the light emitting device, respectively.
In a second aspect, an embodiment of the present application provides a luminance uniformity compensation apparatus, including:
the acquisition module is used for acquiring the luminous efficiency of the luminous devices in each area of the display panel according to the aging rule of the luminous devices in the sample area when the display panel is in a working state, wherein the size and the shape of the sample area are respectively the same as those of any area in each area of the display panel;
a comparison module, configured to determine a reference region according to the light emitting efficiency of the light emitting device in each region, where the light emitting efficiency of the light emitting device is the lowest among all the regions of the display panel;
the compensation module is used for carrying out aging treatment on the light-emitting devices in the to-be-compensated area of the display panel according to the aging rule when the display panel is in a compensation state, so that the light-emitting efficiency of the light-emitting devices in the to-be-compensated area is consistent with that of the light-emitting devices in the reference area, wherein the to-be-compensated area is all other areas of the display panel which do not comprise the reference area;
wherein the aging rule is used for indicating the relationship among the change value of the luminous efficiency of the light-emitting device, the current density and the luminous time at the current density.
In a third aspect, an embodiment of the present application provides a display device, including the luminance uniformity compensation apparatus according to the second aspect;
the brightness uniformity compensation device is used for performing brightness uniformity compensation on the brightness of the display panel.
In a fourth aspect, an embodiment of the present application provides an electronic device, including: at least one processor and memory;
the memory stores computer-executable instructions; the at least one processor executes computer-executable instructions stored by the memory to perform the method of any one of the first aspect of the embodiments of the present application.
In a fifth aspect, the present application provides a computer-readable storage medium, in which program instructions are stored, and when the program instructions are executed by a processor, the method according to any one of the first aspect of the embodiments of the present invention is implemented.
In a sixth aspect, this application embodiment provides a program product, which includes a computer program, where the computer program is stored in a readable storage medium, and the computer program can be read by at least one processor of an electronic device from the readable storage medium, and the computer program is executed by the at least one processor to enable the electronic device to implement the method according to any one of the first aspect of the invention embodiment of this application.
The embodiment of the application provides a brightness uniformity compensation method and device and display equipment. The brightness uniformity compensation method in the application comprises the following steps: when the display panel is in a working state, obtaining the luminous efficiency of the OLED in each area of the display panel according to a pre-obtained aging rule, and determining the aging degree of the OLED in the area with the lowest luminous efficiency. Therefore, when the display panel is in a compensation state, according to the aging rule, the luminous efficiency of the OLED in other areas with high luminous efficiency in the display panel is consistent with that of the OLED in the area with the lowest luminous efficiency, and the luminous efficiency of the OLED in each area in the display panel is the same.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart illustrating a schematic structure of a foldable screen according to an embodiment;
fig. 2 is a flowchart illustrating a luminance uniformity compensation method according to an embodiment of the present disclosure;
FIG. 3a is a graph of the luminous efficiency of OLEDs in different regions according to an embodiment of the present application;
FIG. 3b is a schematic diagram illustrating the reduction of the light emitting efficiency of the OLED in different regions during the compensation phase according to one embodiment of the present application;
FIG. 3c is a graph of the luminous efficiency of the OLED in different regions after compensation according to an embodiment of the present application
Fig. 4 is a flowchart of a luminance uniformity compensation method according to another embodiment of the present application;
FIG. 5 is a graph of luminous efficiency versus time for an OLED according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a luminance uniformity compensation apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the prior art, for a display panel of an electronic device, with the use of the display panel, the light emitting efficiency of an OLED is gradually reduced, but the aging degrees of the OLEDs corresponding to different sub-pixels in the display panel are different, which causes the light emitting efficiency of the OLEDs in the display panel to be different, thereby causing uneven screen brightness. Especially for a folded screen as shown in fig. 1, where the screen 100 is used more frequently than the screen 200, this results in the OLEDs in the screen 100 that are used more frequently aging faster and the OLEDs in the screen 200 that are used less frequently aging. Therefore, the luminous efficiency of the OLEDs of the two partial screens is different, resulting in non-uniformity of the screen brightness display of the folded screen.
To among the prior art, display panel is because the inhomogeneous problem of screen luminance that light emitting device ageing degree difference caused, this application proposes: for a display panel adopting any light-emitting device, the aging degree of the light-emitting devices in the display panel is kept consistent, namely the light-emitting efficiency of the light-emitting devices in the display panel is made consistent, so that the brightness of the display panel is uniform. That is, when the display panel is in an operating state (i.e., the screen of the display panel is lit), the degree of deterioration of each light emitting device during the operating period is acquired. When the display panel is in the compensation state, the light emitting device with small aging degree in the display panel is equivalent to the light emitting device with the most aging degree.
The brightness uniformity compensation method proposed in the present application is described in detail with reference to specific embodiments.
Fig. 2 is a flowchart of a luminance uniformity compensation method according to an embodiment of the present disclosure. As shown in fig. 2, the method of the embodiment of the present application includes:
s201, when the display panel is in a working state, acquiring the luminous efficiency of the OLED in each area of the display panel according to the aging rule of the OLED in the sample area.
The aging rule is used for indicating the relationship among the change value of the luminous efficiency of the OLED, the current density and the luminous time at the current density.
The size and the shape of the sample region are respectively the same as those of any region in each region of the display panel.
In this embodiment, the light emitting device in the present application is described by taking an OLED device as an example. The light emitting device may be, for example, an LED or other light emitting device.
Optionally, the OLED device includes three types of R, G, and B OLED devices.
Since the OLED may age with the OLED display panel, and different OLEDs age differently, different OLEDs have different light emitting efficiencies, and the more the OLED ages, the lower the light emitting efficiency. Therefore, when the current densities of the OLEDs in the display panel are the same, the luminance of the display panel is not uniform. Wherein, the brightness refers to the luminous intensity per unit of projection area, and the unit is candela/square meter. Luminance is a physical quantity representing the intensity of light emission of a light-emitting body, and the luminance of one light-emitting body is the light emission intensity on the surface of the light-emitting body divided by the area on the surface of the light-emitting body.
When the display panel is in an operating state, that is, when a user turns on the display panel using an electronic device provided with the display panel, the larger the current density of the OLED is, the brighter the display panel is. However, the current density negatively affects the luminous efficiency of the OLED, i.e., the higher the current density applied to the OLED, the faster the OLED ages and the faster the luminous efficiency decreases. Moreover, the longer the number of times the OLED is used or in the light-emitting state, the faster the OLED ages, and the lower the light-emitting efficiency. Therefore, the aging degree of an OLED can be judged through the corresponding current density when the OLED emits light and the light emitting time under the current density. For a known sub-pixel, since the luminous efficiency of the OLED is related to the current density and the duration at the current density, the aging law of the OLED can be obtained in advance according to the current density, the duration at the current density and the influence on the luminous efficiency of the OLED. Therefore, according to the aging rule, for the OLED corresponding to any sub-pixel, when the current density applied to the OLED and the duration of the current density are known to be in the operating state of the display panel, the change value of the luminous efficiency of the OLED when the display panel is in the operating state can be determined, and thus the current luminous efficiency of the OLED is determined according to the luminous efficiency of the OLED when the display panel is just in the operating state and the change value of the luminous efficiency of the OLED. The aging law may be expressed, for example, as K ═ f (J, t), where K represents the change in luminous efficiency of the OLED, J represents the current density, and t represents the length of time at said current density. The aging law is obtained according to the OLEDs in the sample area, the sample area may be, for example, any area in the display panel, or an area on the non-display panel that is completely the same as any area in the display panel in size, shape, internal structure, and the like, it can be understood that the display panel described in this embodiment may refer to the display area of the display panel, the sample area may be a part of the display area of the display panel, or may be a test structure for representing the light emitting efficiency of the OLED device in the display area in the non-display area of the display panel, the film structure and material of the test structure are the same as those of the OLED device in the display area of the display panel, and the shape and size are the same as any divided area on the display panel; in addition, the sample region may be an external test structure provided independently of the display panel, and the film structure and material of the sample region are the same as those of the OLED devices in the display region of the display panel, and the shape and size of the sample region are the same as those of any one of the regions divided on the display panel.
When dividing the display panel into regions, the dividing method may include, for example:
the method I is to divide the pixel by taking one sub-pixel (namely one OLED) as a unit;
the method II comprises the steps of dividing the pixel units by taking one pixel unit as a unit;
and thirdly, dividing the display panel by taking a plurality of pixel units as units, wherein the size and the shape of each area obtained after the display panel is divided are the same.
When the sample area is divided in the first mode, the method for obtaining the aging rule according to the sample area in advance comprises the following steps:
since the sub-pixels comprise three types of R, G and B, the OLED corresponding to each sub-pixel is tested respectively to obtain the aging regulation. Thus, the sample OLED includes a sample OLED corresponding to the sub-pixel R, a sample OLED corresponding to the sub-pixel G, and a sample OLED corresponding to the sub-pixel B.
Specifically, for the OLED corresponding to any sub-pixel, the current density J1 of the sample OLED at each of the preset gray scales and the influence of the duration t1 of the current density on the luminous efficiency of the OLED are measured, and according to the above manner, the influence of the corresponding current density and the duration at the current density on the luminous efficiency of the OLED at each gray scale is obtained, so as to obtain the aging rule of the OLED. For example, when the gray scale is 0, the relationship between the current density and the light emitting duration and the change value K of the OLED light emitting efficiency is K1, when the gray scale is 128, the relationship between the current density and the light emitting duration and the change value K of the OLED light emitting efficiency is K2, and when the gray scale is 255, the relationship between the current density and the light emitting duration and the change value K of the OLED light emitting efficiency is K3, the OLED aging rule K is obtained through K1, K2 and K3, for example, the OLED aging rule K is the summation of K1, K2 and K3.
Accordingly, the implementation manner of S201 is:
and when the display panel is in a working state, the driving voltage of the OLED corresponding to each sub-pixel is acquired in real time. When the display panel is in a working state, the driving voltage of each OLED may change, the current of the light emitting device can be obtained according to the driving voltage, and since the size and the shape of each region are the same, only the driving voltage corresponding to at least one gray scale within the preset gray scale needs to be obtained. Therefore, when each driving voltage is obtained, the current density corresponding to the driving voltage and the duration of the current density are obtained, the influence of the applied driving voltage on the OLED luminous efficiency, namely the OLED luminous efficiency change value, is calculated according to the aging rule, and the current luminous efficiency of the OLED in the display panel is obtained in real time. Therefore, when the display panel ends the operation state, the light emitting efficiency of the OLED in the display panel is obtained.
It should be noted that, when the display panel is in the working state, the current density corresponding to at least one gray scale and the duration of the current density may be recorded first, so that when the display panel is in the working state, the influence on the light emitting efficiency of the OLED when the display panel is in the working state is calculated according to the aging rule, and the light emitting efficiency of the OLED in the display panel is obtained.
Optionally, when the mode two is divided, the mode of obtaining the aging rule is as follows:
and obtaining the aging rule of each OLED in the sample pixel unit according to the mode for measuring the aging rule of the single OLED, and obtaining the aging rule corresponding to the sample region according to the aging rule of each OLED. For example, if the aging rule of the OLED1 in the pixel unit is Ka, the aging rule of the OLED2 is Kb, and the aging rule of the OLED3 is Kc, the aging rule K corresponding to the OLED in the sample area may be, for example, an average value of Ka, Kb, and Kc.
Accordingly, the implementation manner of S201 is:
the method comprises the steps of obtaining a driving voltage corresponding to each area when a display panel is in a working state, wherein the driving voltage corresponding to each area changes when the display panel is in the working state, obtaining the driving voltage corresponding to each area when at least one gray scale is in a preset gray scale, obtaining a current density corresponding to the at least one gray scale and a duration of the current density, and therefore calculating a change value of the luminous efficiency of an OLED in each area according to an aging rule, the current density corresponding to the at least one gray scale and the duration of the current density, namely obtaining the luminous efficiency of the OLED when the display panel finishes working.
It should be noted that the variation value of the luminous efficiency of the OLED in any region does not refer to the variation value of the luminous efficiency of each OLED in the region, but is a comprehensive value obtained by comprehensively considering the variation values of the luminous efficiencies of all the OLEDs in the region, and the comprehensive value may be a weighted average value of the variation values of the luminous efficiencies of a plurality of OLEDs.
It should be noted that, when the division is performed in units of pixels, the manner of obtaining the aging rule of the OLED corresponding to one pixel by statistics in advance may refer to the manner of obtaining the aging rule of the OLED corresponding to the divided region by statistics in advance, which is not described herein again, with reference to the manner of obtaining the aging rule of the OLED corresponding to the divided region by statistics in advance.
In practice, the display panel is divided into sub-pixels or pixel units, or into regions having the same size and shape including a plurality of pixel units, and the size and shape of the divided regions are different. The smaller the area of the divided region is, the better the uniformity of the luminance of the display panel after the luminance compensation is.
It should be noted that the preset gray levels may include all gray levels, such as 0-255 gray levels, or some gray levels, wherein some gray levels may be some gray levels that have a larger influence on the light emitting efficiency of the OLED, for example.
S202, determining a reference region according to the luminous efficiency of the light emitting device in each region.
The reference region is a region in which the light emitting efficiency of the light emitting device is the lowest among all regions of the display panel.
In this embodiment, the light emission efficiencies of all the regions in the display panel are compared, and the region having the lowest light emission efficiency is obtained and is referred to as a reference region.
In actual implementation, the region with the lowest luminous efficiency may not be selected, and for example, any region other than the region with the highest luminous efficiency may be selected, and only the lower the luminous efficiency of the selected region with respect to the entire display panel, the more uniform the luminance of the compensated display panel.
And S203, when the display panel is in the compensation state, carrying out aging treatment on the light-emitting device in the region to be compensated of the display panel according to the aging rule, so that the light-emitting efficiency of the light-emitting device in the region to be compensated is consistent with that of the light-emitting device in the reference region.
The area to be compensated is all other areas of the display panel which do not include the reference area.
In this embodiment, the area a, the area B, the area C, and the area D are 4 areas, wherein the 4 areas are all the same in size, shape, structure, and material.
Table 1 shows that, when all of the 4 regions are in the operating state, assuming that the current densities applied to the OLEDs in the regions a, B, C, and D correspond to the gray scale 255, and the OLED of each region has a light emission duration corresponding to the gray scale 255, and the light emission efficiency of the OLED of each region changes after the OLED of each region passes through the corresponding current density and duration. As shown in fig. 3a, since the emitting time is different, the variation of the OLED emission efficiency is different between the regions, wherein the denser the line density is, the lower the emission efficiency is. Therefore, when the display panel is in the compensation state, as shown in fig. 3b, according to the aging rule, the current density and the time length corresponding to the gray scale shown in table 1 are respectively applied to the OLEDs in the 4 regions, so that the luminous efficiency of the OLEDs in the 4 regions is reduced, wherein the denser the lines in fig. 3b are, the more the corresponding luminous efficiency is reduced. After the aging treatment, as shown in fig. 3C, the aging degree of the OLEDs in the region a, the region B, the region C, and the region D is uniform.
TABLE 1
| Region(s) | Working state | Compensation state |
| A | J255 gray scale，2min | J400 gray scale，15min |
| B | J255 gray scale，5hrs | J0 gray scale，15min |
| C | J255 gray scale，1hrs | J400 gray scale，5min |
| D | J255 gray scale，30min | J400 gray scale，1min |
Therefore, according to the principle shown in fig. 3a and 3b, according to the aging rule, the OLED in the region with light aging degree (i.e. the region to be compensated) is aged, and the OLED in the region with the most severe aging degree (i.e. the reference region) is not aged, so that the aging degree of the OLED in the region with light aging degree is consistent with the aging degree of the OLED in the region with the most severe aging degree, and thus, when the display panel operates again, the brightness of the display panel is uniform without brightness difference.
For example, when the display panel of a mobile phone is in a lighting state, a driving voltage is applied to the OLEDs, and when the display panel stops working, the aging degree of the OLEDs in different areas is different, so that if the compensation is not performed, the brightness of the screen is not uniform over time. Therefore, when the display panel does not work, it can be understood here that when the user does not light the display panel, for example, when the user does not use a mobile phone at night, the display panel enters a compensation state, and the OLED in the area with light aging degree in the display panel is aged.
It should be noted that, in the embodiment of the present application, the brightness is uniform, and the absolute brightness value may not be practically the same. The difference between the maximum brightness and the minimum brightness of the display panel may be within a threshold range in which the brightness is substantially the same, i.e. there is no difference in the brightness of the display panel visually to the human eye.
In this embodiment, when the display panel is in the operating state, the light emitting efficiency of the OLED in each region in the display panel is obtained according to the aging rule obtained in advance, and the aging degree of the OLED in the region with the lowest light emitting efficiency is determined. Therefore, when the display panel is in a compensation state, according to the aging rule, the luminous efficiency of the OLED in other areas with high luminous efficiency in the display panel is consistent with that of the OLED in the area with the lowest luminous efficiency, and the luminous efficiency of the OLED in each area in the display panel is the same.
Based on the embodiment shown in fig. 2, fig. 4 is a flowchart of a luminance uniformity compensation method according to another embodiment of the present application. As shown in fig. 4, the method of the embodiment of the present application includes:
s401, when the display panel is in a working state, acquiring the luminous efficiency of the OLED in each area of the display panel according to the aging rule of the OLED in the sample area.
S402, determining a reference area according to the luminous efficiency of the OLED in each area.
In this embodiment, the specific implementation manners of S401 and S402 may refer to S201 and S202, respectively, and are not described herein again.
And S403, acquiring the difference value of the luminous efficiency of the OLED in each area in the area to be compensated and the luminous efficiency of the OLED in the reference area when the display panel is in the compensation state.
In this embodiment, when the display panel does not operate, that is, the OLED does not emit light, a difference between the light-emitting efficiency of the OLED in each region to be compensated and the light-emitting efficiency of the OLED in the reference region is obtained as a difference between the light-emitting efficiencies.
As shown in FIG. 5, where curve 1 is the luminous efficiency K of the OLED in the region of the display panel where the luminous efficiency is the lowest (reference region)(1)The curve 2 is the luminous efficiency K of the OLED in any one of the regions to be compensated (marked as the region to be compensated)(2)Time dependence. When the display panel is just in the working state, the luminous efficiency K of the OLED in the reference area(1)With luminous efficiency K of the OLED in the region to be compensated(2)Similarly, however, since the brightness of the reference region is greater than that of the compensation region, the aging speed of the OLED of the reference region is faster than that of the OLED in the compensation region, and the luminous efficiency K of the OLED of the reference region is increased(1)Luminous efficiency K of OLED gradually smaller than region to be compensated(2). When the display panel starts to be in a non-working state, K(1)And K(2)The difference of (c) is Δ K.
S404, according to the difference value of the aging rule and the luminous efficiency, aging treatment is carried out on the luminous devices in the area to be compensated, and the luminous efficiency of the luminous devices in each area in the area to be compensated is enabled to be consistent with that of the luminous devices in the reference area.
In this embodiment, the difference between the aging degree of the OLED in the region with the light aging degree and the aging degree of the OLED in the region with the most severe aging degree is known, and according to the aging rule, the OLED in the region with the light aging degree is aged when the display panel is in the compensation state, so that the light emitting efficiency of the OLED in the region with the light aging degree is reduced. The reduction value of the luminous efficiency of the OLED in other areas of the display panel is equal to the difference value of the luminous efficiency between the luminous device in each area in the area to be compensated and the luminous device in the reference area, so that the aging degree of the OLED in other areas of the display panel is consistent with the aging degree of the OLED in the area with the most serious aging degree, and the brightness of the display panel is consistent.
With reference to fig. 5, when the display panel is in the compensation state, the aging process is performed only on the OLEDs in the region to be compensated, so that when the display panel is in the compensation state, the OLEDs in the reference region do not age, and the light emitting efficiency corresponding to the end of the previous operation is maintained. Therefore, when the display panel is in a compensation state, the OLED in the region to be compensated emits light by applying the driving voltage to the OLED in the region to be compensated within the preset time period to generate the current density corresponding to the driving voltage, so that the luminous efficiency of the OLED in the region to be compensated is reduced, and the luminous efficiency of the OLED in the region to be compensated is reduced to K(1)Equal, as shown in fig. 5, when the preset length is reached, curve 1 and curve 2 are coincident.
It should be noted that, when the display panel is in the compensation state, a voltage is applied to the OLED in the region to be compensated, and the OLED in the region to be compensated emits light. However, by adjusting the driving voltage, the user may not perceive the display panel to be lit, i.e. the display panel may not be lit for the user, but the OLED is in a light emitting state, and only the emitted light is small. Alternatively, for electronic devices with a folding screen, an unusual display panel may be used as a flashlight. I.e. the user needs to use the flashlight function of the electronic device, the less commonly used display panel is illuminated so that it is in a compensated state. At this time, the user can perceive the display panel to be lit.
Optionally, one possible implementation of S404 is: and adjusting the current density of the light-emitting device in each area in the area to be compensated and the light-emitting time at the current density according to the aging rule and the difference value of the light-emitting efficiency, so that the change value of the light-emitting efficiency of the light-emitting device in each area in the area to be compensated, caused by the current density and the light-emitting time at the current density, is consistent with the difference value of the light-emitting efficiency.
In this embodiment, since the aging rule, that is, the variation value of the luminous efficiency of the OLED is related to the current density and the luminous time length, when the difference of the aging degrees is determined, the current density and the time length at the current density are adjusted according to the aging rule, so that the difference of the aging degree and the aging degree of the OLED is consistent after the adjusted current density and the adjusted current density time length of the OLED are adjusted. That is, the adjusted current density and the time duration at the current density are consistent with the difference between the luminous efficiency and the value of the decrease in the luminous efficiency of the OLED.
When the display panel is in a compensation state and the OLED in the region with light aging degree is aged within a preset time period, for example, a driving voltage may be applied to the OLED during the aging process, and a current with a certain current density flows through the OLED according to the driving voltage, so that the OLED is aged. The current density can be adjusted by adjusting the magnitude of the driving voltage.
Therefore, in the case where the difference in the light emitting efficiency and the current density are determined, the light emitting time period of the OLED can be determined according to the aging law.
When determining the luminous efficiency of any OLED or the OLED in any area, according to the aging law, if the current density is increased, the time length at the current density is reduced. Therefore, for the OLEDs in the less aged regions of the display panel, the aging process is performed for different OLEDs at different time periods according to the difference in luminous efficiency between the OLEDs and the OLEDs in the most aged regions when the applied current density is the same.
In this embodiment, when the display panel is in the operating state, the light emitting efficiency of the OLED in each region in the display panel is obtained according to the aging rule obtained in advance, and the aging degree of the OLED in the region with the lowest light emitting efficiency is determined. Therefore, when the display panel is in a compensation state, the difference value of the luminous efficiency of the OLED in the area with high luminous efficiency and the OLED in the area with the lowest luminous efficiency is determined, and the value of the reduction of the luminous efficiency is equal to the difference value of the aging degree through aging treatment on the basis of the current aging degree of the OLED in the area with light aging degree according to the aging rule, so that the luminous efficiency of the OLED in the area with light aging degree is consistent with the luminous efficiency of the OLED in the area with the most severe aging degree. Therefore, when the display panel is in a working state next time, the brightness of each area of the display panel is consistent, the condition that the brightness of the display panel is uneven due to different aging degrees of the OLEDs in different areas of the display panel is improved, and the watching experience of a user is improved.
Fig. 6 is a schematic structural diagram of a luminance uniformity compensation apparatus according to an embodiment of the present application, and as shown in fig. 6, the luminance uniformity compensation apparatus shown in this embodiment includes: an acquisition module 61, a comparison module 62 and a compensation module 63. Wherein, optionally, the luminance uniformity compensation apparatus further comprises: a test module 64.
The obtaining module 61 is configured to obtain, when the display panel is in an operating state, light emitting efficiencies of the light emitting devices in each region of the display panel according to an aging rule of the light emitting devices in the sample region, where a size and a shape of the sample region are respectively the same as a size and a shape of any one region in each region of the display panel; wherein the aging rule is used to indicate a relationship between a variation value of luminous efficiency of the light emitting device, a current density, and a light emitting period at the current density.
And a comparing module 62 for determining a reference region according to the luminous efficiency of the light emitting devices in each region, wherein the reference region is the region with the lowest luminous efficiency of the light emitting devices in all regions of the display panel.
And the compensation module 63 is configured to, when the display panel is in a compensation state, perform an aging process on the light emitting device in the region to be compensated of the display panel according to an aging rule, so that the light emitting efficiency of the light emitting device in the region to be compensated is consistent with the light emitting efficiency of the light emitting device in the reference region, where the region to be compensated is all other regions in the display panel that do not include the reference region.
Optionally, the testing module 64 is configured to obtain a duration of the light-emitting device in the sample region being in at least one preset gray scale, a current density corresponding to each preset gray scale, and a light-emitting efficiency of the light-emitting device in the sample region; and acquiring an aging rule corresponding to the sample region according to the time length of the light-emitting device in each preset gray scale in the sample region, the current density corresponding to each preset gray scale and the light-emitting efficiency of the light-emitting device in the sample region.
Optionally, the compensation module 63 is specifically configured to obtain a difference between the light-emitting efficiency of the light-emitting device in each of the regions to be compensated and the light-emitting efficiency of the light-emitting device in the reference region; and carrying out aging treatment on the light-emitting devices in the region to be compensated according to the difference between the aging rule and the light-emitting efficiency, so that the light-emitting efficiency of the light-emitting devices in each region in the region to be compensated is consistent with the light-emitting efficiency of the light-emitting devices in the reference region.
Optionally, the compensation module 63 is specifically configured to adjust the current density and the light emitting duration at the current density of the light emitting device in each of the regions to be compensated according to the aging rule and the difference between the light emitting efficiencies, so that a change value of the light emitting efficiency of the light emitting device in each of the regions to be compensated, which is caused by the current density and the light emitting duration at the current density, is consistent with the difference between the light emitting efficiencies.
Optionally, the compensation module 63 is specifically configured to apply a driving voltage to the light emitting device in each of the regions to be compensated; adjusting the current density of the light-emitting device in each area in the area to be compensated by adjusting the driving voltage; and determining the light-emitting time at the current density according to the aging rule, the difference value of the light-emitting efficiency and the current density.
Optionally, the compensation module 63 is specifically configured to increase the current density of the light emitting device in each of the regions to be compensated according to the aging rule and the difference between the light emitting efficiencies, so as to reduce the light emitting time at the current density.
Optionally, the obtaining module 63 is specifically configured to obtain a driving voltage of a light emitting device in each area of the display panel; obtaining the current density of the light-emitting device in each area of the display panel and the duration of the current density according to the driving voltage; and acquiring the aging degree of the light-emitting device in each area of the display panel according to the aging rule, the current density of the light-emitting device in each area of the display panel and the duration of the light-emitting device in the current density.
Optionally, the aging rule is as follows: k ═ f (J, t), where K denotes a change value of the luminous efficiency of the light-emitting device, J denotes a current density, and t denotes a period of time at the current density, where the current density and the period of time at the current density are positively correlated with the degree of aging of the light-emitting device, respectively.
The apparatus of this embodiment may be configured to implement the technical solution of any one of the above-mentioned method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
The brightness uniformity compensation device provided by this embodiment may be a brightness uniformity compensation device that is independent of the display panel, when brightness uniformity compensation is required, the display panel and the brightness uniformity compensation device establish a connection relationship, and after the brightness uniformity compensation is completed, the display panel and the brightness uniformity compensation device are disconnected; on the other hand, the luminance uniformity compensation device may also be a driving chip integrated inside the display apparatus.
Based on the same inventive concept, an embodiment of the present application provides a display apparatus, including a display panel and the luminance uniformity compensation device of any of the above embodiments; the brightness uniformity compensation device is used for performing brightness uniformity compensation on the brightness of the display panel.
Specifically, the display device may be a display module including a display panel and a driving chip, and the obtaining module 61, the comparing module 62 and the compensating module 63 are integrated on the driving chip to implement uniformity compensation on the brightness of the display panel; in another possible manner, the display device may include a display panel, and a luminance uniformity compensation apparatus disposed independently from the display panel, where the luminance uniformity compensation apparatus includes an obtaining module 61, a comparing module 62, and a compensating module 63, and when luminance uniformity compensation needs to be performed on the display panel, a connection relationship between the luminance uniformity compensation apparatus and the display panel is established, and the connection is disconnected after the luminance uniformity compensation is completed.
When the luminous efficiency of the OLED of the display panel is different, the luminance compensation can be carried out through the luminance uniformity compensation device shown in any embodiment of the application, so that the luminous efficiency of the OLED in the display panel is consistent, and the screen luminance is uniform when the display panel is lightened.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (6)
1. A luminance uniformity compensation method, comprising:
when the display panel is in an operating state, acquiring the luminous efficiency of the light-emitting devices in each area of the display panel according to the aging rule of the light-emitting devices in a sample area, wherein the size and the shape of the sample area are respectively the same as those of any area in each area of the display panel;
determining a reference region according to the luminous efficiency of the light emitting devices in each region, wherein the reference region is the region with the lowest luminous efficiency of the light emitting devices in all regions of the display panel;
when the display panel is in a compensation state, acquiring a difference value of luminous efficiency between the luminous efficiency of the luminous device in each region in the region to be compensated and the luminous efficiency of the luminous device in the reference region;
applying a driving voltage to the light emitting device in each of the regions to be compensated;
adjusting the current density of the light emitting device in each area in the area to be compensated by adjusting the driving voltage;
determining the light emitting time at the current density according to the aging rule, the difference value of the light emitting efficiency and the current density, and enabling the change value of the light emitting efficiency of the light emitting device in each area to be compensated caused by the current density and the light emitting time at the current density to be consistent with the difference value of the light emitting efficiency between the light emitting device in each area to be compensated and the light emitting device in the reference area, wherein the area to be compensated is all other areas of the display panel, which do not comprise the reference area;
wherein the aging rule is used for indicating the relationship among the change value of the luminous efficiency of the light-emitting device, the current density and the luminous time at the current density;
the method further comprises the following steps:
acquiring the time length of a light-emitting device in the sample area at least one preset gray scale, the current density corresponding to each preset gray scale and the light-emitting efficiency of the light-emitting device in the sample area;
and acquiring the aging rule corresponding to the sample region according to the time length of the light-emitting device in each preset gray scale in the sample region, the current density corresponding to each preset gray scale and the light-emitting efficiency of the light-emitting device in the sample region.
2. The method of claim 1, wherein said determining a length of time that said current density is at based on said aging rule, said difference in aging level, and said current density comprises:
and according to the difference value between the aging rule and the luminous efficiency, increasing the current density of the luminous device in each area in the area to be compensated so as to reduce the luminous time at the current density.
3. The method according to claim 1 or 2, wherein the obtaining of the luminous efficiency of the light emitting devices in each region of the display panel according to the aging rule of the light emitting devices in the sample region comprises:
acquiring the driving voltage of a light emitting device in each area of the display panel;
obtaining the current density of a light-emitting device in each area of the display panel and the time length of the light-emitting device in the current density according to the driving voltage;
and acquiring the aging degree of the light-emitting device in each area of the display panel according to the aging rule, the current density of the light-emitting device in each area of the display panel and the time length of the light-emitting device in the current density.
4. Method according to claim 1 or 2, characterized in that said aging law is: k ═ f (J, t), where K denotes a change value of luminous efficiency of the light emitting device, J denotes a current density, and t denotes a time period at the current density, where the current density and the time period at the current density are in positive correlation with the degree of aging of the light emitting device, respectively.
5. A luminance uniformity compensation apparatus, comprising:
the acquisition module is used for acquiring the luminous efficiency of the luminous devices in each area of the display panel according to the aging rule of the luminous devices in the sample area when the display panel is in a working state, wherein the size and the shape of the sample area are respectively the same as those of any area in each area of the display panel;
a comparison module, configured to determine a reference region according to the light emitting efficiency of the light emitting device in each region, where the light emitting efficiency of the light emitting device is the lowest among all the regions of the display panel;
the compensation module is used for acquiring the difference value of the luminous efficiency of the luminous device in each region in the region to be compensated and the luminous efficiency of the luminous device in the reference region when the display panel is in a compensation state;
applying a driving voltage to the light emitting device in each of the regions to be compensated;
adjusting the current density of the light emitting device in each area in the area to be compensated by adjusting the driving voltage;
determining the light emitting time at the current density according to the aging rule, the difference value of the light emitting efficiency and the current density, and enabling the change value of the light emitting efficiency of the light emitting device in each area to be compensated caused by the current density and the light emitting time at the current density to be consistent with the difference value of the light emitting efficiency between the light emitting device in each area to be compensated and the light emitting device in the reference area, wherein the area to be compensated is all other areas of the display panel, which do not comprise the reference area;
wherein the aging rule is used for indicating the relationship among the change value of the luminous efficiency of the light-emitting device, the current density and the luminous time at the current density;
the obtaining module is specifically configured to obtain a duration of the light-emitting device in the sample region at least one preset gray scale, a current density corresponding to each preset gray scale, and a light-emitting efficiency of the light-emitting device in the sample region;
and acquiring the aging rule corresponding to the sample region according to the time length of the light-emitting device in each preset gray scale in the sample region, the current density corresponding to each preset gray scale and the light-emitting efficiency of the light-emitting device in the sample region.
6. A display device comprising a display panel and the luminance uniformity compensation apparatus of claim 5;
the brightness uniformity compensation device is used for performing brightness uniformity compensation on the brightness of the display panel.
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| CN116110343A (en) * | 2023-01-17 | 2023-05-12 | 武汉天马微电子有限公司 | Method, device and equipment for compensating brightness attenuation of display panel |
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